That means, Windows 2000 DCs are not supported anymore.

Microsoft does not support them with cooperation with 2012 Domain Controllers. We can check this in domain, where we want to install first 2012 DC.

We need to be sure that connection to this/these DC(s) are available during set up process.

issues updating windows server 2016 r2 schema extensions-88

From, now, Windows Server 2012 will do that for you if it will detect that adprep was not used before for Schema and Infrastructure preparation.

That’s the newest feature in Windows Server 2012 which simplifies promotion process as much as it can.

From Windows Server 2012 we don’t have to run adprep first.

Of course, if you wish, you can still do that but it is not mandatory step.

Choose “Raise Domain Functional Level” and check that.

If you see screen like this (Windows 2003 mode), it means that you do not need to raise your Domain Functional Level.

role and after that in post-installation steps, you can promote it to Domain Controller.

Let’s start Open Server Manager console (if it was not already opened) and click on “Add roles and features” on Dashboard screen controller” and you will see a wizard.

To verify that, we need to use “Active Directory Users and Computers” or “Active Directory Domains and Trusts” console.

Using “Active Directory Users and Computers” console, select your domain and click right mouse button (RMB) on it.

As we are adding Domain Controller into existing domain, we need to select proper option.